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CALIFORNIA CONTRACTORS STATE LICENSE BOARD
(CSLB) C-33 PAINTING AND DECORATING CONTRACTOR
Exam 2026-2027 BANK QUESTIONS WITH DETAILED
VERIFIED ANSWERS EXAM QUESTIONS WILL COME
FROM HERE (100% Latest Already Graded A+
QUESTION 1
A contractor is preparing to apply a high-performance epoxy coating to
a concrete floor in a commercial kitchen. The manufacturer's data
sheet specifies a substrate moisture content of no more than 4 percent.
The contractor uses a calcium chloride moisture test and obtains a
reading of 6 pounds per 1,000 square feet over 24 hours. Which action
is most appropriate?
A) Proceed with the epoxy application because the calcium chloride
test is not relevant to moisture content percentages.
B) Abort the epoxy application and recommend a vapor barrier or
moisture mitigation system before coating.
C) Apply a thin penetrating primer and proceed with the topcoat to seal
the moisture.
D) Increase the epoxy catalyst ratio to compensate for the elevated
moisture.
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Answer: B
Explanation: The calcium chloride test measures the rate of moisture
vapor emission. A reading of 6 pounds is above the typical threshold of
3 pounds for many epoxy systems, indicating excessive moisture.
Proceeding without mitigation risks blistering, delamination, and
adhesive failure. A vapor barrier or moisture mitigation system is
necessary to reduce vapor transmission before coating.
QUESTION 2
When preparing exterior wood siding for repainting, the contractor
observes multiple areas of peeling paint. The underlying wood appears
sound but has a grey, weathered surface. The most effective surface
preparation method to ensure adhesion is:
A) Power washing with a bleach solution and allowing to dry.
B) Scraping loose paint, followed by medium-grit sanding and priming
with an oil-based primer.
C) Applying a chemical paint stripper to remove all existing paint down
to bare wood.
D) Using a heat gun to soften the paint and then scraping, followed by a
latex primer.
Answer: B
Explanation: Scraping removes loose, failing paint. Medium-grit sanding
(e.g., 80-120 grit) feathers the edges and abrades the weathered wood
surface to promote mechanical adhesion. An oil-based primer
penetrates the wood, seals the grain, and provides a stable base for the
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topcoat. Power washing can drive water into the wood, causing future
problems. Complete stripping is usually unnecessary and labor-
intensive. Heat guns risk scorching wood and require caution.
QUESTION 3
According to California regulations, which of the following best
describes the contractor's responsibility regarding lead-safe work
practices when repainting a residential building built in 1950?
A) No special precautions are required if the building is owner-occupied
and has fewer than four units.
B) The contractor must be certified in lead-safe practices and comply
with the Renovation, Repair, and Painting (RRP) Rule if disturbing more
than 6 square feet of interior or 20 square feet of exterior painted
surfaces.
C) Lead-safe practices are only required if the paint is visibly chipping or
peeling.
D) The contractor can delegate all lead safety responsibilities to the
property owner.
Answer: B
Explanation: The EPA's RRP Rule applies to pre-1978 housing and child-
occupied facilities. It requires that firms be certified and that renovators
be trained and use lead-safe work practices when disturbing painted
surfaces exceeding the specified thresholds. Owner-occupancy does not
exempt the work. Visible paint condition is not the sole trigger; the age
of the structure and the scale of disturbance determine applicability.
The contractor cannot delegate liability for worker and occupant safety.
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QUESTION 4
A painting contractor is specifying a coating for structural steel that will
be exposed to a marine environment. The coating system should
provide maximum corrosion resistance. Which type of coating is most
suitable as a primer in this environment?
A) Alkyd primer
B) Epoxy zinc-rich primer
C) Acrylic latex primer
D) Chlorinated rubber primer
Answer: B
Explanation: Epoxy zinc-rich primers provide cathodic protection to
steel, which is critical in high-corrosion marine environments. The zinc
particles sacrifice themselves to protect the steel substrate. Alkyd
primers are not suitable for immersion or severe exposure. Acrylic latex
primers lack the required barrier and cathodic protection. Chlorinated
rubber primers are used in some applications but offer less protection
than zinc-rich epoxies.
QUESTION 5
The contractor is preparing to spray a lacquer-based finish in a confined
interior space. Which of the following safety measures is the highest
priority?
A) Wearing a dust mask
CALIFORNIA CONTRACTORS STATE LICENSE BOARD
(CSLB) C-33 PAINTING AND DECORATING CONTRACTOR
Exam 2026-2027 BANK QUESTIONS WITH DETAILED
VERIFIED ANSWERS EXAM QUESTIONS WILL COME
FROM HERE (100% Latest Already Graded A+
QUESTION 1
A contractor is preparing to apply a high-performance epoxy coating to
a concrete floor in a commercial kitchen. The manufacturer's data
sheet specifies a substrate moisture content of no more than 4 percent.
The contractor uses a calcium chloride moisture test and obtains a
reading of 6 pounds per 1,000 square feet over 24 hours. Which action
is most appropriate?
A) Proceed with the epoxy application because the calcium chloride
test is not relevant to moisture content percentages.
B) Abort the epoxy application and recommend a vapor barrier or
moisture mitigation system before coating.
C) Apply a thin penetrating primer and proceed with the topcoat to seal
the moisture.
D) Increase the epoxy catalyst ratio to compensate for the elevated
moisture.
,2|Page
Answer: B
Explanation: The calcium chloride test measures the rate of moisture
vapor emission. A reading of 6 pounds is above the typical threshold of
3 pounds for many epoxy systems, indicating excessive moisture.
Proceeding without mitigation risks blistering, delamination, and
adhesive failure. A vapor barrier or moisture mitigation system is
necessary to reduce vapor transmission before coating.
QUESTION 2
When preparing exterior wood siding for repainting, the contractor
observes multiple areas of peeling paint. The underlying wood appears
sound but has a grey, weathered surface. The most effective surface
preparation method to ensure adhesion is:
A) Power washing with a bleach solution and allowing to dry.
B) Scraping loose paint, followed by medium-grit sanding and priming
with an oil-based primer.
C) Applying a chemical paint stripper to remove all existing paint down
to bare wood.
D) Using a heat gun to soften the paint and then scraping, followed by a
latex primer.
Answer: B
Explanation: Scraping removes loose, failing paint. Medium-grit sanding
(e.g., 80-120 grit) feathers the edges and abrades the weathered wood
surface to promote mechanical adhesion. An oil-based primer
penetrates the wood, seals the grain, and provides a stable base for the
,3|Page
topcoat. Power washing can drive water into the wood, causing future
problems. Complete stripping is usually unnecessary and labor-
intensive. Heat guns risk scorching wood and require caution.
QUESTION 3
According to California regulations, which of the following best
describes the contractor's responsibility regarding lead-safe work
practices when repainting a residential building built in 1950?
A) No special precautions are required if the building is owner-occupied
and has fewer than four units.
B) The contractor must be certified in lead-safe practices and comply
with the Renovation, Repair, and Painting (RRP) Rule if disturbing more
than 6 square feet of interior or 20 square feet of exterior painted
surfaces.
C) Lead-safe practices are only required if the paint is visibly chipping or
peeling.
D) The contractor can delegate all lead safety responsibilities to the
property owner.
Answer: B
Explanation: The EPA's RRP Rule applies to pre-1978 housing and child-
occupied facilities. It requires that firms be certified and that renovators
be trained and use lead-safe work practices when disturbing painted
surfaces exceeding the specified thresholds. Owner-occupancy does not
exempt the work. Visible paint condition is not the sole trigger; the age
of the structure and the scale of disturbance determine applicability.
The contractor cannot delegate liability for worker and occupant safety.
, 4|Page
QUESTION 4
A painting contractor is specifying a coating for structural steel that will
be exposed to a marine environment. The coating system should
provide maximum corrosion resistance. Which type of coating is most
suitable as a primer in this environment?
A) Alkyd primer
B) Epoxy zinc-rich primer
C) Acrylic latex primer
D) Chlorinated rubber primer
Answer: B
Explanation: Epoxy zinc-rich primers provide cathodic protection to
steel, which is critical in high-corrosion marine environments. The zinc
particles sacrifice themselves to protect the steel substrate. Alkyd
primers are not suitable for immersion or severe exposure. Acrylic latex
primers lack the required barrier and cathodic protection. Chlorinated
rubber primers are used in some applications but offer less protection
than zinc-rich epoxies.
QUESTION 5
The contractor is preparing to spray a lacquer-based finish in a confined
interior space. Which of the following safety measures is the highest
priority?
A) Wearing a dust mask
